[Patch, Fortran] PR51448 [4.6/4.7] Fix realloc with RHS conversion function

[Tobias Burnus]

This fixes a -frealloc-lhs regression where the RHS is handled by a 
"conversion function" whose argument has component refs.

Build and regtested on x86-64-linux.
OK for the trunk and 4.7?

Tobias
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